Measured-service-telephone system



July 24, 1923- W. W. OWEN MEASURED SERVICE TELEPHONE SYSTEM OriginalFiled June 14, 1919 Patented July 24, 1923.

warren stares WILLIAM WALTER OWEN, OF OAK PARK, ILLINOIS, ASSIGNOR T0AUTOMATIC ELEG- TBICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

IllEASURED-SERVICE-TELEPI-IONE SYSTEM.

Application filed June 14, 1919, Serial No. 304,245. Renewed March 24,1923.

America, and a resident of Oak Park, in the county of Cook and State ofIllinois,-

have invented certain new and useful Improvements in MeasuredService-Telephone Systems, of which the following is a specification.

proved measured service telephone system and more specifically to ameans for automatically controlling a coin collecting device such asthat shown and described in U. S. Letters Patent No. 1,043,219, grantedNov. 5, 1912. to O. F. Forsberg.

The principal object of my invention is i to provide improved circuitarrangements and devices to be used in an automatic tele phone systemwhere it is desired to use a pay station such as that shown in the abovementioned patent or any other similar type. i In this way a subscribermay be provided with a coin collector, in which a coin collecting andrefunding magnet is connected to the line circuit when a coin isdeposited and in which a calling device is provided at the telephone tocontrol a series of automatic switches to automatically extend a talkingconnection either to another subscriber or to an operator. It is to beunderstood that a telephone such as I have shown may be called directlythrough jack from an operators cord circuit if desired.

Further objects of my invention are to provide a simple circuitarrangement which is automatically controlled by the joint operations ofa calling and a called subscriber to connect either a positive or anegative high potential battery to the talking circuit to collect orrefund a coin to a calling sub-- scriber. Further details and featuresof my invention will be pointed out in the detailed descriptionfollowing.

In the accompanying figure of drawing I have shown a calling substationA equipped with a receiver and transmitter of the usual type, togetherwith an automatic calling de vice and a coin controlling magnet 2 whichis adapted to be connected to one side of the line circuit by means of apair of springs 3 and 4: which are closed by a coin when such coin isdeposited in the chute. The coin also opens the springs 4 and 5 toremove a short circuit from around the springs The magnet 2 is of suchresistance that it will not operate when normal battery current, such asis used to operate the switches, flows in the talking circuit and isalso of high enough resistance to prevent an improper shunting of thetalking currents. My invention relates in general to an 1m- At C I haveshown a rotary line switch individual to the subscribers line of wellknown type in which the wipers normally stand upon the contacts of thetrunk line last used.

Associated with the line switch C and individual to the line A are apair of relays 6 and 7 which conjointly control the operation of thecoin collect magnet 2.

At D I have shown the essential elements of a connector switch of thewellknown Strowger vertical and rotary type with certain modificationsto adapt it more read ily to my invention. i

lVhen a subscriber at A removes his receiver to initiate a call a coinis firstdeposited, either before or after the receiver is removed, toremove the short circuit from the calling device at springs 4t and 5 andto close springs 3 and 4: to connect the marginal polarized magnet 2 tothe talking circuit. As soon as the receiver is lifted a circuit isclosed for the line relay 8 of line switch C in series with the talkingequipment of the line A.

Relay 8 operates to close a series circuit through relay 9 and rotarymagnet 10 at springs 1]. and also closes a short circuit about relay 9at springs 12. Now if the trunk before which the wipers of the switch Care standing is busy and ground is present on the private or testcontact thereof then the magnet 10 will be energized over a circuitextending from ground through the private wiper through springs 13 and14:, springs 12 and magnet 10 and its interrupter springsto battery thusshort circuiting relay 9. Magnet 10 operates in the manner of a buzzerto rotate the'wipers of the switch C onto thenext trunk line andcontinues its operation until an idle trunkline is reached upon whichthere is no guarding ground. At this time the previously closed seriescircuit of relay 9 and magnet 10 becomes effective and relay 9energizes. Relay 9 being of comparatively high resistance energized bycurrent flowing in the same di rection. After its armatures are onceattracted however the left hand winding is of sufficient strength tomaintain the said armatures in their attracted position. lay 9 alsocloses a holding circuit for itself through springs 13 and 1.7 whichwill later be supplied with ground from the switch ahead. A stillfurther result of the energization of relay 9 is the momentary closingin contact of springs 18, 19 and 20, and as the relay completes itsstroke the springs 19 and 20 are held open. The closure of these threesprings at this time has no effect as relay 8, being slow acting has notyet allowed the springs 21 to close contact.

- W hen the line circuit is thus cut through to the wipers 15 and 16 acircuit is com- 31 and 32, springs 33 and 49, right hand winding ofrelay 7 wiper 15, springs 35 and 36, and upper winding of relay 22 tobattery. The current flowing in the right hand winding of relay 7 atthis time is in such a direction a s to set up a magnetic flux inopposition to that caused by the current in the left hand winding sothat relay 7 does not energize. Relays 22 and 23, however, encrgize overthis circuit. Relay 22 opens the s r ngs 37 and relay 23 closes thesprings 38 n the circuit of the slow release relay Relay 39 energizes tosupply ground to the holding ci cu t of switch establishes a guardingground at the'multiple private test contacts of the switch D. opens thecircuit of the release magnet at springs 40 and 41 and prepares acircuit at springs 42 for the series relay 43 and vertical magnet 44. Itwill be understood that I have shown only a portion of the circuits ofthe connector D but a further disclosure will be unnecessary as suchswitches'are well known in the art and comprise in addition to the partshere showma rotary magnet. busy relay, ringing equi-pemenhetc. Also thisconnector D has direct access to the lines of the'system and the linerelay 22 is operated in response to the digits of the called number tofirst control the vertical magnet and then the rotary magnet to seizethe called line, after which theline is signalled. When the calledsubscriber answers by removinghisreceive'r a circuit is completed forthe back bridge or reversing relay 26, which energizes in series withthe called line and operates to reverse the connections of thelinerelays 22 and 23 with regard to the talking circuit. This causes areversal of the current flowing over said talking circuit to the callingline and therefore through the right hand winding of the relay 7 i Relay7 now attracts its armatures due to the :umulative effect of bothwindings and short circuits its right hand winding through springs 45 toprovide a clear talking circuit and also to prevent further variationsof current from affecting the relay. Relay 7 also closes the springs 46and 47 to prepare a circuit from the positive high voltage battery M.Relay 7 is held in this position by the action of its left hand windingduring conversation, and the subscribers may now converse over the heavyconductors shown.

When conversation is completed the calling subscriber initiates therelease of the connection by restoring his receiver to the switchhookand thereby opening the line circuit and the circuit of line relays22 and 23 of the connector D.

Relay 23 upon deenergizing opens the circuit of release relay 39, whichremoves ground from the holding circuit of relay 9 of the switch C andcloses the circuit of the release magnet 51 of the switch D. Theconnector D is therefole restored to normal and the relay 9 of theswitch C falls back to restore the line switch to normal. As relay 9falls back it momentarily closes the springs 18, 19 and 20 in contact.In this case a circuit is completed for the slow relay 6 through springs21. relay 8 being deenergized. Springs 50 are the last to open contactso that springs 52 may close before springs 50 open to hold relay 7energized. As relay 6 energizes it disconnects the line A from all.connection with the relays of switch C and also closes a circuit fromthe positive high voltage battery M through springs 46 and 47, springs53 and 30, springs would notbe energized to reverse the battery andtherefore relay 7 of the calling line would not be energized. In thiscase when the calling subscriber hangs up his receiver to release theconnection all the operations will be the same, that is, the connector,of such a direction as to operate magnet 2 to direct the deposited coininto a refund chute whereiit can be recovered by the calling subscriberand springs 3, 4 and 5 are restored to normal. 7 i

It will be noticed that in the connector 1) I have provided an extrarelay 23 for controlling the release of the connection, whereas in thepast, the springs 38 were controlled directly by thedouble wound linerelay. I have provided this extra relay 23 in order to insure therelease of the connection 1n case the magnet 2 at thetelephone 18 ofcomparatively low resistance.

For instance, when the battery has been reversed and the calling mandesires to release, it will be seen that even though the line circuit isopened at the switch hook springs yet the magnet 2 and the upperwindingof relay 22 would be in series with battery and ground and relay 22might receive enough current to hold it energized; However, relay 23must always deenergize when the line cir-.

cuit is opened whether battery is reversed or not and will thereforealways fall back and release the connection when the line circuit isopened. It will be understood that if magnet 2 is made of high enoughresistance then relay 23 may be eliminated and springs 38 controlleddirectly by relay 22.

It is to be understood that the normal conductors 60 lead to multiplesets of contacts in the banks of the connectors, and that when the lineofstation A is called over these normal conductors, relay 9 energizesonly part way due to a mechanical interlocking device controlled by therelay 8. When the line is called, therefore, relay 9 opens springsand34, separates spring 28 from its back contact, but does not close theconnection to the wipers nor operate springs 18, 19, and 2O.

It will be seen therefore that I have provided a very eflicie'nt, simpleand easily applieddevice "for automatically controlling a coin collectorto either collect or refund a coin to a calling subscriber afterconversation is completed-and in such a manner asto prevent a subscriberfrom interfering with the operation. i i i I wish it understood'thatalthough I have illustrated only one embodiment of my invention, variouschanges in the automatic switches may be made without departing from thespirit of my invention; for instance, any number of selectors may beinserted between the line switch C and the connector switch D withoutinterfering with the operation of the circuits and mechanism forcontrolling the coin collector.

Having described and pointed out the features and aspects ofmyinvention, what I consider to be new and desire to have protected byLetters Patent will be pointed out in the appended claims.

\Vhat I claim as my invention is:

1. In a telephone system, a line, an automatic progressively movabletrunking switch individual to said line, wipers for said switch, saidline normally disconnected from said wipers, a relay for connecting saidline with the wipers when energized, a coin collector for the linehaving means for either collecting or refunding coin, and meansresponsive to the deenergization of said relay for operating the coincollector to either collect or refund a coin.

2. In a telephone system, a line, a coin collecting device for the line,a magnet for controlling said device to either collect or refund a coin,an automatic trunking switch individual to said line responsive to theinitiation of a call fromsaid line for selecting an idle trunk line,means for extending a connection from said. trunk line to a called line,a relay individual to said line switch responsive to a called subscriberfor preparing a circuit for said magnet, and means controlled by therelease of said line switch for completing the circuit to operate saidmagnet to collect a coin.

3. In a telephone system, a line, a bridge across said line, a coincollector for said line having a magnet for controlling the operationthereof, an automatic switch, a

, bridge cut off relay for the line energized when the line is called todisconnect said switch from the line, and energized when the line iscalling to cut the line through to the wipers of the switch, and meanscontrolled by the deenergization of said relay only when the line iscalling for controlling the operation of said magnet to either collector refund a coin for the calling subscriber.

4. In a telephone system, a line, a calling device and a coin collectingdevice for said line, said calling device normally inoperative until. acoin is deposited in said coin collecting device, a magnet forcontrolling the coin, an automatic switch individual to the line andresponsive to the initial closure of the line to extend a connectiontherefrom, a line relay for the switch in bridge of said line, a bridgeout off relay for disconnecting said. line relay from the line,

other relay, a circuit for said other relay controlled jointly by theline and cut ott relays, and means controlled by the operation of saidother relay for controlling said magnet to either collect or refunda'depositedv coin, depending upon whether or not the call wassuccessful.

5. In a telephone system, a line, a telephone, on oneend of said lineand an auto- ,matic switch on the other end thereof, a battery, a magnetat the telephone connect edfr'om the line to one side of said battery,

' pair of line reliiys :tor the switch bridged across the line in serieswith the battery, a

releasing device in the line circuit at the telephone consisting of:means for opening the line circuit on one side of said magnet, means forreversing: the connection of the line relays to the line circuit, one oisaid relays deenei'gized when the line is opened whether the connectionsare reversed or not,

and releasing; means for said switch Cmtrolled by said last mentionedrelay.

6. In a telephone system. a line, an automatic switch, atrunkii'inswitch "for extend inn said line to said automatic switch whencalling, a line relay 'lior controlling the said line relay, and meansfor preventing said cut-oft relay from operating said magnet whenenergized responsive to an incoming call.

7. In a telephone system, lines, acoin collector for each line, anautomatic progressively movable switch 'lorextendiiig a talking circuitfrom any of said lines to another line, a conductor. separate from thetalking circuit, means controlled over said conductor for controllingthe release oi. said auton'iatic switch, a relay controlled over saidrelease circuit, and means controlled bysai'd relay for controllino' theoperation of said coin collector to either collector refund a coindeposited in said collector.

8. In a telephone system, a line, a coin collecting device for saidline, an automatic switch for said line. another automatic switch, saidfirst switch for extendinga connection therefrom to said other automatic switch, a trunk release circuit con trolled from said other switchfor releasing said first switch, and means controlled over said trunkrelease circuit for controlling the operation of said coincollect-ingdevice toeither collector refund a deposited coin.

9. In an automatic telephone system, a telephone station, a centralexchangeoilice, a line connecting the telephone with the central ofiice,aeoin collecting box at thetele phone station, an automaticprogressively movable automatic switchat the central of:-

Free tor connecting the calling line with any one of several otherlines, a battery at the central oiiice, means at the telephone forsending impulses from said battery for operating said automatic switch,a magnet at the telephone for controlling the operation ct said coincollecting bog, a relay tor said an tomatic switch, means for releasingsaid switch controlled by saidirelay, said relay connected with oneterminal of said battery,

means for connecting the other terminal of said battery with either sideof said line,

and means for insuring that theother side of said relay shall always beconnected to the side of the lineopposite that to which the connected.

10. In an automatic telephone system, a progressively movable automaticswitch, a line terminating'in said switch, means for (mendin said switchto connect said line with any one of several other lines, releasemechanism for said switch, a battery for operating'said switch, a devicefor connectsaid other terminal ofsaid battery has been U ingone terminalor said battery to either one of the two sides of said l1ne,a relay forsaid automatic switch, said relay controlling the release mechanism ofsaid switch, one terminal of said-relay connected to the otherterminaloi. said battery, means included in said device for switchingthe other terminal ofsaid relay to the side of the line opposite whichthe said first-mentioned termin al ot the said battery is connected, acoin collectingdevice associated ,wlththe end of said line opposite theend terminating in said automatic switch, and 'amagnet for controllingsaid coin collecting device, said magnetconnect'ed at said other end ofsaid line between the line and the second mentioned terminalot saidbattery;

11. In a telephone: system, an automatic switch, a subscriber-s lineconnected to said switch, a pair oiireljays for said switch energizedover the two sides of said line in series, release meclianis'i'n' forsaid switch, said mechanism controlled by one of ,said relays and saidrelease relay connected to oneterminal of the battery, a measuredservice, de vice, a magnet at the telephone for controlling saidmeasured service device','said magnet connected between the sameterminal of said battery and said line, saidother relay in said switchfor controlling the operation of said switch, said last mentioned relayconnected to the other terminal otsa'id battery, and means at thetelephone for severing the connection between the said two relays ofsaid automatic switch.

l2. In a telephone system, an automatic switch, a subscribers lineconnected to said switch, a pair of relays for said switch energizedover the two sides of said line in series, release mechanism for saidswitch, said mechanism controlled by one of said relays and said releaserelay connected to one. terminal of the battery, a measured servicedevice, a magnet at the telephone for controlling said measured servicedevice, said magnet connected between the same terminal of said batteryand said line, said other relay in said switch for controlling theoperation of said switch, said last mentioned relay connected to theother terminal of said battery, and means at the switchhool-z forsevering the connection between the said two relays of said automaticswitch.

13. In a telephone system, means for connecting two telephonesubscribers in a talk ing connection, said means including a pair ofprogressively movable automatic switches, an assessing device incombination therewith, release means for one of said switches, saidrelease means controlled from the other switch over a circuit excludingthe talking circuit, said assessing device also under the control ofsaid releasing circuit for assessing a charge for the connection, andmeans under the control of the ca ling subscriber for controlling saidrelease circuit to cause the operation of said releasing means torelease one of said switches and to cause the operation of saidassessing device.

1 In a telephone system in which a connection is established between twotelephones through the medium of two links, each link having anautomatic progressively movable switch individual thereto, one of saidswitches having release means controlled by the other switch over atrunk release circuit, the combination of a coin controlled measuredservice device at the calling phone, and means individual to one of thelinks for op erating said device to collect or refund a coin, theoperation of the said last means controlled over said trunk releasecircuit.

15. In a telephone system,a line, a coin collecting device for saidline, a magnet for controlling said device to collect or refund a coin,means including a series of automatic switches controlled from said lineto extend a talking circuit to another line, a trunk release circuit forcontrolling the release of one of said switches separate from thetalking circuit, and a relay controlled over said trunk release circuitfor operating said magnet to either collect or refund a coin.

16. In a telephone system, a line, a coin collecting device for theline, a magnet for controlling said device to collect or refund a coin,means including a series of auto matic switches for extending a talkingcircuit to a called line, a conductor separate from the talking circuitfor controlling the release of the first switch of the series, and meanscontrolled over said conductor for operating said magnet by an increasedflow of current to either collect or refund coins.

17. In a telephone system, a subscribers line, a coin collecting deviceat the station on said line, a magnet for controlling said device tocollect or refund deposited coins, means including a series of automaticswitches for extending a talking circuit from said line to a calledline, a conductor separate from the talking circuit for controlling therelease of the first switch of the series, a. relay controlled over saidconductor for operating said magnet by an increased flow of current, anda second relay controlled over a conductor of the talking circuit fordetermining whether any given coin will be collected or refunded by saidmagnet.

18. In a telephone system, a subscribers line, an automatic switchcontrolled over said line to extend a talking connection from said lineto a called line, a grounded battery at the exchange, a double woundline relay for controlling said switch bridged across the talkingcircuit in series with said battery, a connection from the line toground at the station on said line independent of the switchhook, and arelay for controlling the release of said switch connected in the linerelay bridge between one talking conductor and the grounded pole of saidbattery, whereby the subscriber on said line can control the release ofthe switch by hanging up his receiver without interference from saidground connection.

Signed by me at Chicago, Cook Illinois, this 10th day of June, 1919.

WILLIAM NALTER OWEN.

County,

